I came across a question with the tag mwe today, and I deleted that tag because there were no other questions with the same tag and I find it very misleading in the context of stackexchange (Minimal Working Example comes immediately to my mind).
I see also that there are two questions to the tag mwes that is only slightly better.
I suggest to delete both tags. If a tag for multi word expressions is deemed useful, it should be verbose IMO, like multi-word-expression.
